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A kind of preparation method of nano aluminum nitride reinforced aluminum matrix composite material

A nano-aluminum nitride and reinforced aluminum-based technology, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of complex process, limited molding, low content, etc., and achieve process cost Low, easy to operate, evenly distributed effect

Active Publication Date: 2016-04-06
广西平果巨昌铝业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation of nanocomposites through traditional processes has problems such as easy aggregation of nanoparticles, low content, complex process, and limited molding, which will hinder its further development.

Method used

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  • A kind of preparation method of nano aluminum nitride reinforced aluminum matrix composite material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] First, nano aluminum nitride (20nm), aluminum (16 μm) and magnesium (70 μm) powders were ball milled in isopropanol for 20 minutes, wherein the mass ratio of aluminum nitride, aluminum and magnesium powders was 1:2:1, and the ball milling speed 100rpm. Stand still, remove isopropanol, and bake at 200°C for 1 hour; put the aluminum alloy in a graphite crucible to heat and melt it, and at a temperature of 750°C, the amount of nano-aluminum nitride added is 1wt.% of the aluminum alloy melt , adding the above powder into the aluminum alloy melt for 5 minutes, introducing high-energy ultrasonic waves into the aluminum alloy melt during the addition process, the ultrasonic frequency and power were 20KHZ, 700W, and then continued ultrasonic treatment for 5 minutes; the melt temperature Control it at 720°C, continue ultrasonication for 2 minutes, pour it into a metal model that has been preheated at 400°C, and take samples after cooling.

Embodiment 2

[0012] First, nano-aluminum nitride (20nm), aluminum (16μm) and magnesium (70μm) were ball milled in isopropanol for 20min, wherein the mass ratio of aluminum nitride, aluminum and magnesium powder was 1:2:1, and the ball milling speed was 100 rpm. Stand still, remove isopropanol, and bake at 200°C for 1 hour; put the aluminum alloy in a graphite crucible to heat and melt it, and at a temperature of 780°C, the amount of nano-aluminum nitride added is 1wt.% of the aluminum alloy melt , adding the above powder into the aluminum alloy melt for 5 minutes, introducing high-energy ultrasonic waves into the aluminum alloy melt during the addition process, the ultrasonic frequency and power were 20KHZ, 1000W, and then continued ultrasonic treatment for 5 minutes; the melt The temperature was controlled at 720°C, and ultrasonication was continued for 2 minutes, poured into a metal model preheated at 400°C, and samples were taken after cooling.

Embodiment 3

[0014] First, nano-aluminum nitride (20nm), aluminum (16μm) and magnesium (70μm) were ball milled in isopropanol for 30 minutes, wherein the mass ratio of aluminum nitride, aluminum and magnesium powder was 2:6:1, and the ball milling speed was 100 rpm. Stand still, remove isopropanol, and bake at 200°C for 1 hour; put the aluminum alloy in a graphite crucible to heat and melt it, and at a temperature of 750°C, the amount of nano-aluminum nitride added is 2wt.% , adding the above powder into the aluminum alloy melt for 8 minutes, introducing high-energy ultrasonic waves into the aluminum alloy melt during the addition process, the ultrasonic frequency and power were 20KHZ, 1000W, and then continued ultrasonic treatment for 10 minutes; the melt The temperature was controlled at 720°C, and ultrasonication was continued for 2 minutes, poured into a metal model preheated at 400°C, and samples were taken after cooling.

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Abstract

The invention provides a preparation method for a nanometer aluminum nitride-reinforced aluminum-based composite material. The preparation method comprises the following steps: subjecting nanometer aluminum nitride, aluminum and magnesium powder to ball milling in isopropanol for 20 to 30 min, wherein a mass ratio of aluminum nitride to aluminum to magnesium powder is 1: 2: 1 to 4: 12: 1, and a ball milling speed is 100 to 150 rpm; carrying out standing and removal of isopropanol and then carrying out baking at 200 to 250 DEG C for 0.5 to 1 h; putting an aluminum alloy in a graphite crucible for heating and melting, adding the above-mentioned powder into the aluminum alloy melt with an adding amount of 1 to 5 wt% of the aluminum alloy melt based on nanometer aluminum nitride at 750 to 780 DEG C, wherein addition time lasts for 5 to 15 min, introducing high energy supersonic waves with ultrasonic frequency of 20 KHZ and power of 700 to 1000 W in the process of addition and carrying out ultrasonic treatment for 5 to 20 min; and controlling the temperature of the melt to be 720 to 740 DEG C, continuing ultrasonic treatment for 2 to 4 min, pouring the melt into a metal pattern preheated at 400 to 450 DEG C and carrying out cooling. The process has the advantages of low cost, easiness, safety, reliability and convenient operation; and crystal grains in the structure of the prepared material are fine, and a nanometer aluminum nitride reinforcing phase is uniformly distributed and has no agglomeration phenomenon.

Description

technical field [0001] The invention belongs to the field of metal material preparation, and in particular relates to a preparation method of an aluminum-based composite material. Background technique [0002] Particle-reinforced aluminum matrix composites have many advantages such as specific strength, high specific stiffness, high wear resistance, and high vibration damping. Aluminum nitride (AlN) is an ideal reinforcing phase because of its good physical, chemical, mechanical and thermal properties, and has attracted the attention of many scholars. Micron particles can improve the yield strength and ultimate compressive strength of the matrix, but make the ductility of the matrix worse. Nanoparticles can increase the elastic modulus of the matrix while maintaining a high content. strength. Hardness, wear resistance and high temperature creep, so it has gradually received attention. However, the preparation of nanocomposites through traditional processes has problems s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/10C22C1/02B82Y40/00B82Y30/00
Inventor 闫洪陈小会
Owner 广西平果巨昌铝业有限公司